Finding the Fourth Proportional to 112,386.72, 155,109.15 and 64,638.84

Step by Step Solution

1. Step 1: Write the proportion equation
   112,386.72 : 155,109.15 = 64,638.84 : x
2. Step 2: Convert to fraction form
   112,386.72/155,109.15 = 64,638.84/x
3. Step 3: Cross multiply
   112,386.72x = 155,109.15 × 64,638.84
4. Step 4: Simplify right side
   112,386.72x = 10,026,075,529.39
5. Step 5: Solve for x
   x = 10,026,075,529.39/112,386.72
6. Step 6: Final answer
   x = 89,210.50